The OBS-3+ sensor measures suspended solids and turbidity by the optical backscatter method. It features a compact micro probe that responses almost linearly over a 1000-fold change in sediment concentration and turbidity.

Features

• Measures turbidity and suspended solids
  
• Compact micro low-power probe
  
• Integral Voltage clamp and 4-20 mA current loop

Applications

• River and stream gauging
  
• Add-on sensor for CTDs, data loggers, and current meters
  
• Permit compliance
  
• Control water quality in settling ponds and tanks
  
• Sediment transport research
  
• Laboratory measurements

Specifications

• Ranges
  
  • Turbidity: 0-2,000 NTU
    
  • SSC: Mud 0-2,500 mg/l; Sand 0-50 g/l-1

• Accuracy
  
  • Turbidity: 0.25 NTU or 1% of reading
    
  • Concentration : Mud 0.5 mg/l or 1% of reading; Sand 0.25 g/l or 1% of reading

• Other data
  
  • Maximum data rate: 10 Hz
    
  • Infrared wavelength: 850 nm
    
  • Maximum depth: 500 m
    
  • Drift: < 2% / year
    
  • Power: 5 V / 10 mA
    
  • Housing Material: 316 stainless steel or titanium
    
  • Dimensions: 138 X 25 mm
    
  • Day-light rejection: -28 dB (re: 48 mW cm-1)
    
  • Output: 0-1.25 V; 0-2.50 V; 4-20 mA